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/*
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* Copyright (c) 2016 Google Inc.
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* Copyright (c) 2016 KongQun Yang (kqyang@google.com)
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*
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* This file is part of FFmpeg.
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*
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* FFmpeg is free software; you can redistribute it and/or
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* modify it under the terms of the GNU Lesser General Public
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* License as published by the Free Software Foundation; either
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* version 2.1 of the License, or (at your option) any later version.
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*
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* FFmpeg is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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* Lesser General Public License for more details.
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*
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* You should have received a copy of the GNU Lesser General Public
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* License along with FFmpeg; if not, write to the Free Software
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* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
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*/
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#include "libavutil/pixdesc.h"
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#include "libavutil/pixfmt.h"
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#include "libavcodec/avcodec.h"
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#include "vpcc.h"
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enum VPX_CHROMA_SUBSAMPLING
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{
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VPX_SUBSAMPLING_420_VERTICAL = 0,
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VPX_SUBSAMPLING_420_COLLOCATED_WITH_LUMA = 1,
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VPX_SUBSAMPLING_422 = 2,
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VPX_SUBSAMPLING_444 = 3,
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};
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static int get_vpx_chroma_subsampling(AVFormatContext *s,
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enum AVPixelFormat pixel_format,
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enum AVChromaLocation chroma_location)
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{
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int chroma_w, chroma_h;
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if (av_pix_fmt_get_chroma_sub_sample(pixel_format, &chroma_w, &chroma_h) == 0) {
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if (chroma_w == 1 && chroma_h == 1) {
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return (chroma_location == AVCHROMA_LOC_LEFT)
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? VPX_SUBSAMPLING_420_VERTICAL
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: VPX_SUBSAMPLING_420_COLLOCATED_WITH_LUMA;
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} else if (chroma_w == 1 && chroma_h == 0) {
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return VPX_SUBSAMPLING_422;
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} else if (chroma_w == 0 && chroma_h == 0) {
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return VPX_SUBSAMPLING_444;
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}
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}
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av_log(s, AV_LOG_ERROR, "Unsupported pixel format (%d)\n", pixel_format);
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return -1;
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}
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static int get_bit_depth(AVFormatContext *s, enum AVPixelFormat pixel_format)
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{
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const AVPixFmtDescriptor *desc = av_pix_fmt_desc_get(pixel_format);
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if (desc == NULL) {
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av_log(s, AV_LOG_ERROR, "Unsupported pixel format (%d)\n",
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pixel_format);
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return -1;
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}
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return desc->comp[0].depth;
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}
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static int get_vpx_video_full_range_flag(enum AVColorRange color_range)
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{
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return color_range == AVCOL_RANGE_JPEG;
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}
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// Find approximate VP9 level based on the Luma's Sample rate and Picture size.
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static int get_vp9_level(AVCodecParameters *par, AVRational *frame_rate) {
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int picture_size = par->width * par->height;
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int64_t sample_rate;
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// All decisions will be based on picture_size, if frame rate is missing/invalid
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if (!frame_rate || !frame_rate->den)
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sample_rate = 0;
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else
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sample_rate = ((int64_t)picture_size * frame_rate->num) / frame_rate->den;
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if (picture_size <= 0) {
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return 0;
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} else if (sample_rate <= 829440 && picture_size <= 36864) {
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return 10;
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} else if (sample_rate <= 2764800 && picture_size <= 73728) {
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return 11;
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} else if (sample_rate <= 4608000 && picture_size <= 122880) {
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return 20;
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} else if (sample_rate <= 9216000 && picture_size <= 245760) {
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return 21;
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} else if (sample_rate <= 20736000 && picture_size <= 552960) {
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return 30;
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} else if (sample_rate <= 36864000 && picture_size <= 983040) {
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return 31;
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} else if (sample_rate <= 83558400 && picture_size <= 2228224) {
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return 40;
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} else if (sample_rate <= 160432128 && picture_size <= 2228224) {
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return 41;
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} else if (sample_rate <= 311951360 && picture_size <= 8912896) {
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return 50;
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} else if (sample_rate <= 588251136 && picture_size <= 8912896) {
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return 51;
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} else if (sample_rate <= 1176502272 && picture_size <= 8912896) {
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return 52;
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} else if (sample_rate <= 1176502272 && picture_size <= 35651584) {
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return 60;
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} else if (sample_rate <= 2353004544 && picture_size <= 35651584) {
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return 61;
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} else if (sample_rate <= 4706009088 && picture_size <= 35651584) {
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return 62;
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} else {
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return 0;
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}
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}
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int ff_isom_get_vpcc_features(AVFormatContext *s, AVCodecParameters *par,
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AVRational *frame_rate, VPCC *vpcc)
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{
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int profile = par->profile;
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int level = par->level == FF_LEVEL_UNKNOWN ?
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get_vp9_level(par, frame_rate) : par->level;
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int bit_depth = get_bit_depth(s, par->format);
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int vpx_chroma_subsampling =
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get_vpx_chroma_subsampling(s, par->format, par->chroma_location);
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int vpx_video_full_range_flag =
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get_vpx_video_full_range_flag(par->color_range);
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if (bit_depth < 0 || vpx_chroma_subsampling < 0)
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return AVERROR_INVALIDDATA;
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if (profile == FF_PROFILE_UNKNOWN) {
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if (vpx_chroma_subsampling == VPX_SUBSAMPLING_420_VERTICAL ||
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vpx_chroma_subsampling == VPX_SUBSAMPLING_420_COLLOCATED_WITH_LUMA) {
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profile = (bit_depth == 8) ? FF_PROFILE_VP9_0 : FF_PROFILE_VP9_2;
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} else {
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profile = (bit_depth == 8) ? FF_PROFILE_VP9_1 : FF_PROFILE_VP9_3;
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}
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}
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vpcc->profile = profile;
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vpcc->level = level;
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vpcc->bitdepth = bit_depth;
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vpcc->chroma_subsampling = vpx_chroma_subsampling;
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vpcc->full_range_flag = vpx_video_full_range_flag;
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return 0;
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}
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int ff_isom_write_vpcc(AVFormatContext *s, AVIOContext *pb,
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AVCodecParameters *par)
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{
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VPCC vpcc;
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int ret;
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ret = ff_isom_get_vpcc_features(s, par, NULL, &vpcc);
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if (ret < 0)
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return ret;
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avio_w8(pb, vpcc.profile);
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avio_w8(pb, vpcc.level);
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avio_w8(pb, (vpcc.bitdepth << 4) | (vpcc.chroma_subsampling << 1) | vpcc.full_range_flag);
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avio_w8(pb, par->color_primaries);
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avio_w8(pb, par->color_trc);
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avio_w8(pb, par->color_space);
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// vp9 does not have codec initialization data.
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avio_wb16(pb, 0);
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return 0;
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}
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